Optical transceiver

ABSTRACT

An optical transceiver includes a main board, a fiber joint, a circuit board, a transfer board, metal traces, photoelectric elements, a lens set, a connection base, and an amplifier. The fiber joint is coupled to the lens set and connection base for positioning plural optical fibers. The connection base is coupled to the main board, and the circuit board is electrically connected to the main board. The transfer board is disposed between the fiber joint and circuit board. Each of the metal traces is arranged on both of two neighboring surfaces of the transfer board. The photoelectric elements are respectively coupled to metal traces on the surface of the transfer board facing the fiber joint, and axially aim to the optical fibers, respectively. The amplifier electrically connects the circuit board and the photoelectric elements via the metal traces.

RELATED APPLICATIONS

The present application is a Divisional Application of the U.S.application Ser. No. 14/517,933, filed Oct. 20, 2014, which claimspriority to Taiwan Application Serial Number 103127092, filed Aug. 7,2014, all of which are herein incorporated by reference.

BACKGROUND

Field of Invention

The present invention relates to an optical transceiver. Moreparticularly, the present invention relates to an optical transceiverfor performing a single-path photoelectric conversion and a multi-pathphotoelectric conversion.

Description of Related Art

Nowadays, optoelectronic communication technology is capable ofproviding rapid and bulk information transmission, which in turn causesthe application of the optoelectronic communication technology to becomemore and more prevalent. In the applications of optoelectroniccommunication technology, an optical transceiver is coupled to bothin-line equipment and fiber-optic equipment so as to assist the in-lineequipment in utilizing the fiber circuit normally. The main function ofthe optical transceiver is to convert received light signals intoelectric signals, or to convert electric signals into light signals toperform transmitting.

For example, the optical transceiver comprises photoelectric elements(such as a laser or light emitting diode and a light detecting diode)and amplifying devices arranged thereon. The photoelectric elements andthe amplifying devices are electrically connected to each other by wiresthrough a wire bonding process or a molding process. However, when ahigh-speed electric signal is transmitted to the photoelectric elementfrom the amplifying device through the wire, a voltage drop or noiseinterference usually occurs. As a result, quality of the electric signalexchanged between the photoelectric element and the amplifying device isaffected to result in an error, thus affecting the transmission result.

For the forgoing reasons, there is a need for solving theabove-mentioned inconvenience and shortcoming by providing an opticaltransceiver, which is also an objective that the relevant industry iseager to achieve.

SUMMARY

One objective of the present invention is to provide an opticaltransceiver for solving the inconvenience and shortcoming in the priorart, and to utilize two vertical surfaces or non-vertical surfaces ofthe transfer board (such as a ceramic plate plated with gold) to solvethe difficulty in electric signal transmission and decrease the numberof high-speed signal traces.

Another objective of the present invention is to provide an opticaltransceiver so as to increase light coupling efficiency by directlyoptical coupling.

Still another objective of the present invention is to provide anoptical transceiver so as to improve the convenience and efficiency ofassembly by utilizing passive light coupling technology.

According to one embodiment, an optical transceiver is provided. Theinvention provides an optical transceiver. The optical transceivercomprises a main board, a connection base, a fiber joint, a circuitboard, a transfer board, a plurality of metal traces, a plurality ofphotoelectric elements, and two amplifiers. The main board comprises aplurality of connecting terminals. The connection base is coupled to onesurface of the main board, and the connection base includes a base body;at least one fixing insert formed on a bottom of the base body forinserting on the main board; a first slot is located on a side of thebase body; and a second slot is located on another side of the base bodycommunicated with the first slot. The fiber joint is coupled to thesurface of the main board and the side of the base body for positioninga plurality of optical fibers. The circuit board inserts into the secondslot transversely, and is coupled to the surface of the main board, andelectrically connected to the main board. The transfer board is insertedinto the first slot longitudinally, and located between the fiber jointand the circuit board. The transfer board includes a first surface and asecond surface adjacent to each other, and the first surface facestowards the fiber joint. The metal traces are arranged spaced apart onthe transfer board, and each of the metal traces are arranged on boththe first surface and the second surface of the transfer board. Thephotoelectric elements are coupled to the first surface of the transferboard and axially aim to the optical fibers, respectively. Theamplifiers are located on the circuit board and electrically connectedto the circuit board and the photoelectric elements respectively throughthe metal traces.

In the foregoing, the main board has a plurality of printed traces, eachof the printed traces is electrically connected to one of the metaltraces and one of the amplifiers respectively through two wires.

In the foregoing, the photoelectric elements are combinations of aplurality of light emitting devices and a plurality of light detectingdiodes. One of the two amplifiers is only electrically connected to thelight emitting devices. Another one of the two amplifiers is onlyelectrically connected to the light detecting diodes.

In the foregoing, the optical transceiver further comprises a pluralityof metal traces. The metal traces are arranged spaced apart on thetransfer board. Each of the metal traces is arranged on both the firstsurface and the second surface of the transfer board. The amplifiers areelectrically connected to the photoelectric elements respectivelythrough the metal traces.

In the foregoing, the optical transceiver further comprises a pluralityof anti-soldering lines. The anti-soldering lines are arranged spacedapart on the transfer board and arranged in parallel between the metaltraces.

In the foregoing, the amplifiers are electrically connected to the metaltraces respectively through a plurality of wires.

In the foregoing, the main board has a plurality of printed traces. Eachof the printed traces is electrically connected to one of the metaltraces and one of the amplifiers respectively through two wires.

In the foregoing, the main board has a plurality of printed traces. Eachof the printed traces is electrically connected to one of the amplifiersthrough a wire, and is electrically coupled to one of the metal tracesdirectly.

In the foregoing, the main board has a plurality of printed traces. Theamplifiers are respectively electrically coupled to the printed tracesdirectly through a flip chip method, and the metal traces arerespectively electrically coupled to the printed traces directly.

In the foregoing, the connection base comprises a base, at least onefixing insert, a first slot, and a second slot. The fixing insert isformed on a bottom of the base for being fixed on the main board. Thefirst slot is located on a side of the base close to the fiber joint forinserting the transfer board into the first slot longitudinally. Thesecond slot is located on a side of the base being away from the fiberjoint communicated with the first slot for inserting the circuit boardinto the second slot transversely.

In the foregoing, the circuit board comprises a first block and a secondblock. The second block protrudes from a side of the first block. Thesecond block is inserted into the second slot of the connection basetransversely. The amplifiers are located on the second block inparallel.

In the foregoing, the second block of the circuit board contacts theconnection base.

In the foregoing, the fiber joint comprises a joint body, a light signaloutput portion, a receiving recess, and a plurality of positioningchannels. The light signal output portion is located at one end of thejoint body facing towards the transfer board. The receiving recess islocated at one end of the joint body opposite to the transfer board foraccommodating the optical fibers. The positioning channels are arrangedin the light signal output portion for respectively positioning theoptical fibers so that light incident surfaces of the optical fibersaxially aim to the photoelectric elements, respectively.

In the foregoing, each of the positioning channels passes through twoopposite surfaces of the light signal output portion. An aperturediameter formed by the positioning channels on the surface of the lightsignal output portion facing towards the transfer board is smaller thanan aperture diameter formed by the positioning channels on the surfaceof the light signal output portion being away from the transfer board.

In the foregoing, an aperture diameter of each of the positioningchannels gradually narrows from the receiving recess to the light signaloutput portion.

In the foregoing, the fiber joint comprises a fiber gasket mounted onthe receiving recess. The fiber gasket comprises a plurality ofdivisional islands arranged spaced apart and respectively defining aplurality of guiding slots for respectively guiding the optical fibersto the positioning channels correspondingly.

In the foregoing, two ends of each of the divisional islandsrespectively have a guiding camber for guiding the optical fibers to adisposition direction.

In the foregoing, the optical transceiver further comprises a lens set.The lens set comprises a lens body, a plurality of first lenses, and aplurality of second lenses. The lens body is fixed between the fiberjoint and the connection base. The lens body comprises a firsttransceiving surface and a second transceiving surface disposed oppositeto each other. The first lenses are disposed on the first transceivingsurface and axially aim to the positioning channels, respectively. Thesecond lenses are disposed on the second transceiving surface andaxially aim to the first lenses and the photoelectric elements,respectively.

In the foregoing, the optical transceiver further comprises at least oneguide post. The connection base has at least one first positioning hole.The lens body has at least one second positioning hole. The joint bodyhas at least one third positioning hole. The at least one firstpositioning hole, the at least one second positioning hole, the at leastone third positioning hole are coaxial and co-receive the at least oneguide post inserted into the at least one first positioning hole, the atleast one second positioning hole, and the at least one thirdpositioning hole so that the lens set is fixed between the fiber jointand the connection base.

In the foregoing, the second surface of the transfer board is a surfaceof the transfer board being opposite to the main board.

In the foregoing, the second surface of the transfer board is a surfaceof the transfer board facing towards the main board.

In the foregoing, the photoelectric elements are a combination of lightemitting devices and light detecting diodes which are arranged on thefirst surface of the transfer board in a matrix.

In the foregoing, one part of the metal traces electrically connectingto the light emitting devices are arranged in parallel on one part ofthe transfer board, and the other part of the metal traces electricallyconnecting to the light detecting diodes are arranged in parallel onanother part of the transfer board.

In the foregoing, the optical transceiver further includes a pluralityof metal linear grooves arranged in parallel between the metal tracesalternately. Each of the metal linear grooves is formed on both thefirst surface and the second surface of the transfer board, andelectrically isolated from the metal traces, one of the metal lineargrooves is arranged between any two neighboring ones of the metaltraces.

In the foregoing, the optical transceiver further includes a pluralityof anti-soldering lines arranged on both the first surface and thesecond surface of the transfer board which are spaced apart and inparallel between the metal traces alternately.

It is to be understood that both the foregoing general description andthe following detailed description are by examples, and are intended toprovide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a furtherunderstanding of the invention, and are incorporated in and constitute apart of this specification. The drawings illustrate embodiments of theinvention and, together with the description, serve to explain theprinciples of the invention. In the drawings,

FIG. 1 depicts a perspective view of an optical transceiver according toa first embodiment of this invention;

FIG. 2A is an exploded view of the optical transceiver viewed from oneview angle according to the first embodiment of this invention;

FIG. 2B is an exploded view of the optical transceiver viewed fromanother view angle according to the first embodiment of this invention;

FIG. 3 depicts a perspective view of the optical transceiver after aprotective cover is removed according to the first embodiment of thisinvention;

FIG. 4A depicts a partially enlarged view of a transfer board of theoptical transceiver according to the first embodiment of this invention;

FIG. 4B depicts a cross-sectional view of a photoelectric module of theoptical transceiver according to the first embodiment of this invention;

FIG. 5 depicts a perspective view of the connection base in FIG. 2;

FIG. 6 depicts a perspective view of the circuit board in FIG. 2A;

FIG. 7 depicts a perspective view of the fiber joint viewed from theoptical fibers in FIG. 2A;

FIG. 8 depicts a perspective view a fiber gasket in FIG. 2A;

FIG. 9 depicts a perspective view of the fiber gasket in FIG. 2A viewedfrom bottom of the fiber pad;

FIG. 10 depicts a perspective view of a lens set viewed from the opticalfibers in FIG. 2A;

FIG. 11 depicts a perspective view of the lens set viewed from thetransfer board in FIG. 2A;

FIG. 12 depicts a cross-sectional view of a photoelectric module of anoptical transceiver according to a second embodiment of this invention;

FIG. 13 depicts a cross-sectional view of a photoelectric module of anoptical transceiver according to a third embodiment of this invention;and

FIG. 14 depicts a cross-sectional view of a photoelectric module of anoptical transceiver according to a fourth embodiment of this invention.

DESCRIPTION OF THE EMBODIMENTS

In the following detailed description, for purposes of explanation,numerous specific details are set forth in order to provide a thoroughunderstanding of the disclosed embodiments. It will be apparent,however, that one or more embodiments may be practiced without thesespecific details. In other instances, well-known structures and devicesare schematically depicted in order to simplify the drawings.

The following description uses language by referring to terms in thefield of this invention. If any term is defined in the specification,such term should be explained accordingly. Besides, the terms referredto the prepositions “above”, “under”, “on”, “onto”, “in’, “into”, etc.in the disclosed embodiments can be directly or indirectly “above”,“under” an object or a reference object and directly or indirectly “on”,‘onto”, “in”, “into” an object or a reference object provided that theseembodiments are still applicable. The mentioned “indirect” means that anintermediate object or a physical space exists between the objects. Theterms referred to “adjacent”, “neighboring”, “between”, etc. in thedisclosed embodiments can be an intermediate object or a space existingbetween two objects or two reference objects or no intermediate objector no space existing between two objects or two reference objectsprovided that these embodiments are still applicable. In addition, thefollowing description relates to an optical transceiver, and the knowndetail in this field will be omitted if such detail has little to dowith the features of the present invention. Furthermore, the shape,size, and scale of any element in the disclosed figures are justexemplary for understanding, not for limiting the scope of thisinvention.

As used herein, “around,” “about” or “approximately” shall generallymean within 20 percent, preferably within 10 percent, and morepreferably within 5 percent of a given value or range. Numericalquantities given herein are approximate, meaning that the term “around,”“about”, or “approximately” can be inferred if not expressly stated.

First Embodiment

FIG. 1 depicts a perspective view of an optical transceiver 100according to a first embodiment of this invention. FIG. 2A is anexploded view of the optical transceiver 100 viewed from one view angleaccording to the first embodiment of this invention. FIG. 2B is anexploded view of the optical transceiver 100 viewed from another viewangle according to the first embodiment of this invention. FIG. 3depicts a perspective view of the optical transceiver 100 after aprotective cover C is removed according to the first embodiment or thisinvention.

As shown in FIG. 1 to FIG. 3, the optical transceiver 100 comprises amain board 200, a fiber joint 400, and a photoelectric module PE. Thefiber joint 400 is connected to the photoelectric module PE, and boththe fiber joint 400 and the photoelectric module PE are located on themain board 200.

In greater detail, the photoelectric module PE comprises a connectionbase 300, a circuit board 500, a transfer board 600 (i.e., a ceramicplate plated with gold on both sides thereof, or a ceramic plate platedwith copper on both sides thereof), a plurality of photoelectricelements, and a plurality of amplifiers. The photoelectric elements maybe, for example, light emitting devices (in the following laser or lightemitting diodes 710 are taken as an example) and light detecting diodes720. The amplifiers may be, for example, a first amplifier 730 and asecond amplifier 740. The connection base 300 is coupled to a topsurface 210 of the main board 200. The fiber joint 400 is coupled to thetop surface 210 of the main board 200 and one side of the connectionbase 300 for positioning a plurality of optical fibers 470 thereon. Thecircuit board 500 is coupled to the top surface 210 of the main board200 and one side of the connection base 300 opposite to the fiber joint400. The transfer board 600 is fixed on the connection base 300 andlocated between the fiber joint 400 and the circuit board 500. Since asize of the main board 200 is larger than sizes of the connection base300, the fiber joint 400, the circuit board 500, and the transfer board600, the connection base 300, the fiber joint 400, the circuit board500, the transfer board 600, the photoelectric elements (such as thelaser or light emitting diodes 710 and the light detecting diodes 720),the amplifiers (such as the first amplifier 730 and the second amplifier740) are all carried on the main board 200. In the present embodiment,the optical transceiver 100 may be encapsulated through molding andcovered by a protective cover C so as to protect devices including thefiber joint 400 and the photoelectric module PE on the main board 200.

Hence, when the optical transceiver 100 of the first embodiment iscoupled to an electrical connector of an external device (not shown inthe figure), a plurality of connecting terminals 220 (such as metalcontacts) of the main board 200 and connecting terminals (such as metalcontacts) of the electrical connector of the external device areelectrically connected to each other to allow the optical transceiver100 of the first embodiment to exchange an electric signal with theexternal device.

FIG. 4A depicts a partially enlarged view of the transfer board 600 ofthe optical transceiver 100 according to the first embodiment of thisinvention. FIG. 4B depicts a cross-sectional view of the photoelectricmodule of the optical transceiver 100 according to the first embodimentof the invention.

As shown in FIG. 4A and FIG. 4B, the transfer board 600 comprises afirst surface 610 and a second surface 620 adjacent to each other. Itshould be understood that the adjacent first surface 610 and secondsurface 620 are not limited to the first surface 610 and the secondsurface 620 that are directly connected. However, in other embodimentsof the present invention, the adjacent first surface and second surfacealso refer to that another inclined surface is between the first surfaceand the second surface of the transfer board so that the first surfaceand the second surface of the transfer board do not adjoin each other.The first surface 610 faces the fiber joint 400 (see FIG. 3). Forexample, the transfer board 600 is in a rectangular shape. The secondsurface 620 and the first surface 610 are approximately perpendicular toeach other, and the second surface 620 is the surface of the transferboard 600 being opposite to the main board 200.

The photoelectric elements are combinations of the plurality of laser orlight emitting diodes 710 and the plurality of light detecting diodes720. Each of the laser or light emitting diodes 710 and the lightdetecting diodes 720 is coupled to the first surface 610 of the transferboard 600, and the laser or light emitting diodes 710 and the lightdetecting diodes 720 axially aim to light incident surfaces of theoptical fibers 470, respectively (see FIG. 2B). However, the presentinvention is not limited in this regard. The laser or light emittingdiodes 710 and the light detecting diodes 720 are arranged in a matrix(for example: linear) on the first surface 610 of the transfer board600. Each of the first amplifier 730 and the second amplifier 740 isdirectly disposed on the circuit board 500, and electrically connectsthe circuit board 500 and the laser or light emitting diodes 710 or thelight detecting diodes 720 (see FIG. 2B).

It should be understood that the so-called aiming axially means linearlight coupling or linear light projection to the light incident surfaces(end faces) of the optical fiber 470 without being projected to thelight incident surfaces (end faces) of the optical fibers 470 through areflecting mirror surface. In other words, an optical axis of each ofthe photoelectric elements passes through an axial direction along whichthe optical fibers 470 extend.

In greater detail, as shown in FIG. 4A, the first amplifier 730 is onlyelectrically connected to the laser or light emitting diodes 710. Thesecond amplifier 740 is only electrically connected to the lightdetecting diodes 720. The laser or light emitting diodes 710 axially aimto the light incident surfaces (end faces) of one part of the opticalfibers 470, respectively, for converting electric signals to lightsignals and outputting the light signals. The laser or light emittingdiode 710 may be, for example, a laser diode or a light emitting diode(LED), and may be abbreviated to a light emitting device, but thepresent invention is not limited in this regard. The light detectingdiodes 720 axially aim to the light incident surfaces (end faces) of theother part of the optical fibers 470, respectively, for receiving thelight signals and converting the light signals to electric signals. Thelight detecting diode 720 is, for example, a photodiode, but the presentinvention is not limited in this regard.

The transfer board 600 comprises a plurality of metal traces. The metaltraces are arranged on the transfer board 600, and are spaced apart inparallel. Each of the metal traces is arranged on both the first surface610 and the second surface 620 of the transfer board 600. Both the laseror light emitting diodes 710 and the light detecting diodes 720 aredisposed on the first surface 610 of the transfer board 600, and boththe laser or light emitting diodes 710 and the light detecting diodes720 are electrically coupled to partial regions of the metal traces onthe first surface 610 of the transfer board 600, respectively. Theamplifiers corresponding to the laser or light emitting diodes 710 andthe light detecting diodes 720 are electrically connected to thephotoelectric elements respectively through the metal traces so as toamplify electric signals.

The above-mentioned metal traces are combinations of a plurality offirst metal traces 810 and a plurality of second metal traces 820. Thefirst metal traces 810 are disposed on one part of the transfer board600 and are spaced apart and in parallel, and each of the first metaltraces 810 is arranged on both the first surface 610 and the secondsurface 620 of the transfer board 600. The laser or light emittingdiodes 710 are disposed on the first surface 610 of the transfer board600, and are respectively coupled to the first metal traces 810 on thefirst surface 610 of the transfer board 600. The first amplifier 730 iselectrically connected to the laser or light emitting diodes 710respectively through the first metal traces 810 and is configured foramplifying electric signals to be transmitted to the laser or lightemitting diodes 710. The second metal traces 820 are disposed on anotherpart of the transfer board 600 and are spaced apart and in parallel, andeach of the second metal traces 820 is arranged on both the firstsurface 610 and the second surface 620 of the transfer board 600. Thelight detecting diodes 720 are disposed on the first surface 610 of thetransfer board 600, and are respectively coupled to the second metaltraces 820 on the first surface 610 of the transfer board 600. Thesecond amplifier 740 is electrically connected to the light detectingdiodes 720 respectively through the second metal traces 820 and isconfigured for amplifying electric signals to be transmitted from thelight detecting diodes 720.

Hence, with the disposition of the metal traces (such as the first metaltraces 810 and the second metal traces 820) on the first surface 610 andthe second surface 620 of the transfer board 600 according to the aboveembodiment, a transmission distance between the photoelectric elements(such as the laser or light emitting diodes 710 and the light detectingdiodes 720) and the amplifiers corresponding to the photoelectricelements is significantly reduced. As a result, when the first amplifier730 transmits an amplified output signal to the laser or light emittingdiodes 710 via the first metal traces 810, or when the light detectingdiodes 720 transmit an input signal to the second amplifier 740 via thesecond metal traces 820, the chance that the output/input signal has avoltage drop or is interfered with noises is reduced to solve thedifficulty in electric signal transmission and decrease a number ofhigh-speed signal traces so as to reduce the probability ofdeterioration of the electric signals.

In the first embodiment, as shown in FIG. 4A, the above-mentioned laseror light emitting diodes 710 and light detecting diodes 720 arerespectively soldered to localized regions of the first metal traces 810and the second metal traces 820 on the first surface 610 of the transferboard 600 by using solder. In this manner, the above-mentioned laser orlight emitting diodes 710 are electrically coupled to the localizedregions of the first metal traces 810 on the first surface 610 of thetransfer board 600 directly, and the above-mentioned light detectingdiodes 720 are electrically coupled to the localized regions of thesecond metal traces 820 on the first surface 610 of the transfer board600 directly.

In addition, in order to avoid that the solder crosses and iselectrically connected to the neighboring first metal trace 810 orsecond metal trace 820, the transfer board 600 further comprises aplurality of anti-soldering lines 830. The anti-soldering lines 830arranged on the transfer board 600 are spaced apart and are arranged inparallel between the first metal traces 810 and between the second metaltraces 820 alternately.

Hence, when the above-mentioned laser or light emitting diodes 710 andlight detecting diodes 720 are respectively soldered to the first metaltraces 810 and the second metal traces 820, the anti-soldering lines 830are able to block the crossing of solder so as to avoid that theneighboring first metal traces 810 or the neighboring second metaltraces 820 are electrically connected to each other. The anti-solderinglines 830, the first metal traces 810, and the second metal traces 820are made of a same material. However, the present invention is notlimited in this regard. In other embodiments, the anti-soldering linesmay be changed to bumps or grooves.

A description is provided with reference to FIG. 3 and FIG. 4B. In thefirst embodiment, the first amplifier 730 is electrically connected tothe first metal traces 810 (see FIG. 4A) respectively through aplurality of first wires L1 so as to electrically connect theabove-mentioned laser or light emitting diodes 710. In greater detail,the first amplifier 730 is connected to localized regions of the firstmetal traces 810 on the second surface 620 of the transfer board 600respectively through the plurality of first wires L1. The secondamplifier 740 is electrically connected to the second metal traces 820(see FIG. 4A) respectively through a plurality of second wires L2 so asto electrically connect the above-mentioned light detecting diodes 720.In greater detail, the second amplifier 740 is connected to localizedregions of the second metal traces 820 on the second surface 620 of thetransfer board 600 respectively through the plurality of second wiresL2.

However, the present invention is not limited to the above embodiment.Other variations are described in the second embodiment to the fourthembodiment as follows.

FIG. 5 depicts a perspective view of the connection base 300 in FIG. 2.In the first embodiment, as shown in FIG. 2A and FIG. 5, the connectionbase 300 comprises a base 310, a plurality of fixing inserts 320, afirst slot 330, and a second slot 340. There are, for example, twofixing inserts 320 located on a surface of the base 310 facing towardsthe main board 200 that are respectively inserted into fixing holes 230(see FIG. 2A) of the main board 200 so that the connection base 300 isfixed on the main board 200. The first slot 330 is located on one sideof the base 310, for example, located on the side of the base 310 closeto the fiber joint 400. Hence, the transfer board 600 can be insertedinto the first slot 330 longitudinally. That is, the transfer board 600is inserted into the first slot 330 from the connection base 300 towardsthe main board 200. The second slot 340 is located on another side ofthe base 310, for example, located on the side of the base 310 farthestaway from the fiber joint 400. Hence, the circuit board 500 can beinserted into the second slot 340 transversely. That is, the circuitboard 500 is inserted into the second slot 340 from the connection base300 towards the fiber joint 400.

FIG. 6 depicts a perspective view of the circuit board 500 in FIG. 2A.In the first embodiment, as shown in FIG. 2B and FIG. 6, the circuitboard 500, being approximately in a shape of “T”, comprises a firstblock 510 and a second block 520. The second block 520 protrudes fromone side of the first block 510 to allow the second block 520 to beinserted into the second slot 340 (see FIG. 5) of the above-mentionedconnection base 300 transversely. Two chip areas 530 are disposed at anend of the second block 520 farthest away from the first block 510 toallow the first amplifier 730 and the second amplifier 740 to be placedon the two chip areas 530 (see FIG. 2B) in parallel. In addition, partof the two chip areas 530 may extend towards the first slot 330 so thatthe second block 520 is as close to the connection base 300 as possibleor contacts the connection base 300. In this manner, the transmissiondistance between the photoelectric elements (that is, the light emittingdevices and the light detecting diodes) and the amplifiers correspondingto the photoelectric elements is significantly reduced to reduce thechance that the output/input signal has a voltage drop or is interferedwith noises. As a result, the probability that the electric signalsdeteriorate is reduced. Additionally, since the second slot 340 exposesthe top surface 210 of the main board 200 (see FIG. 2A), the circuitboard 500 is still allowed to be electrically coupled to the top surface210 of the main board 200 directly after being inserted into the secondslot 340 so as to electrically connect the above-mentioned connectingterminals 220 (see FIG. 1).

FIG. 7 depicts a perspective view of the fiber joint viewed from theoptical fibers in FIG. 2A. In the first embodiment, as shown in FIG. 2Aand FIG. 7, the fiber joint 400 comprises a joint body 410, a receivingrecess 430, and a plurality of positioning channels 440. The receivingrecess 430 is depressed on a top surface of the joint body 410 foraccommodating the above-mentioned optical fibers 470. One end of thejoint body 410, that is the end of the joint body 410 facing towards thetransfer board 600, has a light signal output portion 450.

The positioning channels 440 are arranged in the light signal outputportion 450 in a linear matrix manner. The optical fibers 470 arerespectively positioned in the positioning channels 440. In greaterdetail, all the positioning channels 440 pass through two oppositesurfaces of the light signal output portion 450. An aperture diameter441 formed by the positioning channels 440 on the surface of the lightsignal output portion 450 facing towards the transfer board 600 issmaller than an aperture diameter 442 formed by the positioning channels440 on the surface of the light signal output portion 450 facing awayfrom the transfer board 600 (see FIG. 7). In addition, two oppositeouter sides of the joint body 401 comprise a plurality of snap slots411. The snap slots 411 are configured for engaging snap fasteners C1 ofthe protective cover C in the snap slots 411.

As shown in FIG. 2A, since the positioning channels 440 axially aim tothe photoelectric elements (that is, the light detecting diodes 720 andthe laser or light emitting diodes 710), respectively, and the opticalfibers 470 respectively pass through apertures of the positioningchannels 440 facing towards the transfer board 600 and are then cut, thelight incident surfaces (end faces) of the optical fibers 470 evenlyemerge at the apertures formed by the positioning channels 440 on thesurface of the light signal output portion 450 facing towards thetransfer board 600 so that the light incident surfaces (end faces) ofthe optical fibers 470 axially aim to the photoelectric elements (thatis, the light detecting diodes 720 and the laser or light emittingdiodes 710), respectively.

It is understood that, when laser is utilized to evenly cut the opticalfibers 470 passing through the apertures of the positioning channels 440facing towards the transfer board 600, the laser needs to be tilted at aspecific angle before the optical fibers 470 can be severed. Hence, twochamfers 451 opposite to each other are disposed on the light signaloutput portion 450 to prevent the laser from touching the light signaloutput portion 450 that causes charring.

In practices, as shown in FIG. 7, an aperture diameter of each of thepositioning channels 440 gradually narrows from the receiving recess 430to the light signal output portion 450. Because the aperture diameter442 of the positioning channels 440 on the surface of the light signaloutput portion 450 facing away from the transfer board 600 is largerthan the aperture diameter 441 of the positioning channels 440 on thesurface of the light signal output portion 450 facing towards thetransfer board 600, rapid insertion of the optical fibers 470 into thepositioning channels 440 is facilitated and the optical fibers 470 arepositioned in the positioning channels 440.

FIG. 8 depicts a perspective view a fiber gasket 480 in FIG. 2A. FIG. 9depicts a perspective view of the fiber gasket 480 in FIG. 2A viewedfrom bottom of the fiber gasket 480. As shown in FIG. 8 and FIG. 9, thefiber joint 400 further comprises a fiber gasket 480. The fiber gasket480 is mounted on the receiving recess 430. In greater detail, as shownin FIG. 9, the fiber gasket 480 comprises a sheet body 481 and twoopposite mounting ribs 485. The mounting ribs 485 are located on abottom surface of the sheet body 481 and are configured for insertinginto two opposite mounting slots 460 (see FIG. 2B) on a top surface ofthe joint body 410 to allow the fiber gasket 480 to be fixed on thejoint body 410.

In greater detail, the fiber gasket 480 further comprises a plurality ofdivisional islands 482. The divisional islands 482 are arranged spacedapart on a top surface of the sheet body 481 and respectively define aplurality of guiding slots 484. The guiding slots 484 are used forcompletely separating the optical fibers 470 and respectively guidingthe optical fibers 470 to the positioning channels 440 correspondingly.A length 482L of the divisional islands 482 is approximately the same asa width 481W of the top surface of the sheet body 481 so as to separatethe optical fibers 470 to the corresponding positioning channels 440effectively. Additionally, two ends of each of the divisional islands482 respectively have a guiding camber 483. The guiding cambers 483further facilitate the guidance of the optical fibers 470 to thedisposition direction and avoid fractures of the optical fibers 470.

FIG. 10 depicts a perspective view of a lens set 900 viewed from theoptical fibers 470 in FIG. 2A. FIG. 11 depicts a perspective view of thelens set 900 viewed from the transfer board 600 in FIG. 2A.

In addition, as shown in FIG. 10 and FIG. 11, the optical transceiver100 further comprises a lens set 900 according to the first embodiment.The lens set 900 comprises a lens body 910, a plurality of first lenses980, and a plurality of second lenses 990. The lens body 910 is fixedbetween the fiber joint 400 and the connection base 300. The lens body910 comprises a first transceiving surface 950 and a second transceivingsurface 970 opposite to each other. The first lenses 980 are disposed onthe first transceiving surface 950, and the second lenses 990 aredisposed on the second transceiving surface 970. A diameter 980D of thefirst lenses 980 is smaller than a diameter 990D of the second lenses990. As shown in FIG. 2A and FIG. 2B, the first lenses 980 axially aimto the positioning channels 440, respectively. Additionally, the secondlenses 990 are disposed on the second transceiving surface 970 andaxially aim to the first lenses 980 and the photoelectric elements (thatis, the light detecting diodes 720 and the laser or light emittingdiodes 710), respectively. The first lenses 980 or/and the second lenses990 may be spherical lenses or aspherical lenses, but the presentinvention is not limited in this regard.

In greater detail, the first transceiving surface 950 has a recessedgroove 960. The first lenses are arranged on a bottom of the recessedgroove 960.

The lens body 910 further comprises a first spacing rib 920 and a secondspacing rib 930 having a different size from each other. The firstspacing rib 920, being larger than the second spacing rib 930, islocated on the first transceiving surface 950 and abuts against thefiber joint 400. Hence, with the functions of the first spacing rib 920and the recessed groove 960, an expected distance between the lightsignal output portion 450 and the first lenses 980 is ensured so as tomaintain a focal length that the first lenses 980 should have relativeto the optical fibers 470. The second spacing rib 930 is located on thesecond transceiving surface 970 and abuts against a surface of theconnection base 300 facing towards the fiber joint 400. Hence, with thefunction of the second spacing rib 930, an expected distance between thephotoelectric elements (that is, the laser or light emitting diodes 710and the light detecting diodes 720) on the first surface 610 of thetransfer board 600 and the second lenses 990 is ensured so as tomaintain a focal length that the second lenses 990 should have relativeto the above photoelectric elements.

With additional reference to FIG. 2A, two opposite sides of the base 310of the connection base 300 have two first positioning holes 350. Twoopposite sides of the lens body 910 of the lens set 900 have two secondpositioning holes 940. Two opposite sides of the joint body 410 of thefiber joint 400 have two third positioning holes 420. The firstpositioning hole 350, the second positioning hole 940, and the thirdpositioning hole 420 on the same side are coaxial and co-receive apositioning guide post R (such as a high precision guide post) insertedinto them so that the lens set 900 is fixed between the fiber joint 400and the connection base 300.

Therefore, when a user assembles the optical transceiver 100 of theembodiment, the user assembles the connection base 300 to the main board200, assembles the transfer board 600 and the circuit board 500 to theconnection base 300, and positions the lens set 900 and the fiber joint400 onto the connection base 300 by utilizing the above method. Anencapsulation portion (not shown in the figure) is then covered on thefiber joint 400, the circuit board 500, the connection base 300, thetransfer board 600, the photoelectric elements (such as the laser orlight emitting diodes 710 and the light detecting diodes 720), the firstamplifier 730, the second amplifier 740, and the main board 200. Thefiber joint 400, the circuit board 500, the connection base 300, thetransfer board 600, the laser or light emitting diodes 710, the lightdetecting diodes 720, the first amplifier 730, and the second amplifier740 are thus packaged on the main board 200 to protect the opticalfibers 470 on the fiber joint 400, the first metal traces 810 and thesecond metal traces 820 on the transfer board 600.

In addition, as shown in FIG. 3, when the lens set 900 is assembledbetween the fiber joint 400 and the connection base 300, the twoopposite sides of the lens body 910 adjacent to the second positioningholes 940 and the connection base 300 respectively define a gap 911.Each of the gaps 911 is communicated with the second positioning hole940 and exposes one of the positioning guide posts R to allow a fixingadhesive to be applied to the first positioning hole 350, the secondpositioning hole 940, and the third positioning hole 420 on the sameside via the gap 911. As a result, the positioning guide posts R arefixed in the lens set 900, the fiber joint 400, and the connection base300.

Second Embodiment

FIG. 12 depicts a cross-sectional view of a photoelectric module of anoptical transceiver according to a second embodiment of this invention.As shown in FIG. 12, an optical transceiver 101 of the second embodimentis approximately the same as the optical transceiver 100 in FIG. 3. Theonly difference is that the main board 200 further has a plurality ofprinted traces P on the main board 200. Each of the printed traces P iselectrically connected to the first metal trace 810 (or the second metaltrace) and the first amplifier 730 (or the second amplifier) through athird wire L3 and a fourth wire L4, respectively. In greater detail,each of the printed traces P is printed on the top surface of the mainboard 200 and is between the circuit board 500 and the laser or lightemitting diode 710. Each of the printed traces P is connected to thefirst amplifier 730 (or the second amplifier) through the fourth wire L4and is connected to the localized region of the first metal trace 810(or the second metal trace) on the second surface 620 of the transferboard 600 through the third wire L3.

Third Embodiment

FIG. 13 depicts a cross-sectional view of a photoelectric module of anoptical transceiver according to a third embodiment of this invention.As shown in FIG. 13, an optical transceiver 102 of the third embodimentis approximately the same as the optical transceiver 101 in FIG. 12. Theonly difference is that a second surface 621 of the transfer board 600is on a surface of the transfer board 600 rightly facing towards themain board 200 rather than on the surface of the transfer board 600facing away from the main board 200. Each of the printed traces P on thetop surface 210 of the main board 200 is electrically couple to thefirst metal trace 810 (or the second metal trace) directly, and isconnected to a localized region of the first metal trace 810 on thesecond surface 621 of the transfer board 600.

Fourth Embodiment

FIG. 14 depicts a cross-sectional view of a photoelectric module of anoptical transceiver according to a fourth embodiment of this invention.As shown in FIG. 14, an optical transceiver 103 of the fourth embodimentis approximately the same as the optical transceiver 102 in FIG. 13. Theonly difference is that the first amplifier 730 or/and the secondamplifier 740 is not electrically connected to the printed trace Pthrough wire bonding. Rather, the first amplifier 730 or/and the secondamplifier 740 is electrically coupled to the printed traces P on the topsurface 210 of the main board 200 through a flip chip method, whichmeans a vertically reversed circuit board 501 is electrically coupled tothe printed trace P on the top surface 210 of the main board 200directly through an electrode contact B of the first amplifier 730or/and the second amplifier 740 facing downward.

Although the present invention has been described in considerable detailwith reference to certain embodiments thereof, other embodiments arepossible. Therefore, the spirit and scope of the appended claims shouldnot be limited to the description of the embodiments contained herein.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of the presentinvention without departing from the scope or spirit of the invention.In view of the foregoing, it is intended that the present inventioncover modifications and variations of this invention provided they fallwithin the scope of the following claims and their equivalents.

What is claimed is:
 1. An optical transceiver comprising: a main board;a connection base coupled to one surface of the main board, theconnection base comprising a base body; at least one fixing insertformed on a bottom of the base body for inserting on the main board; afirst slot located on a side of the base body; and a second slot locatedon another side of the base body communicated with the first slot; afiber joint coupled to the surface of the main board and the side of thebase body for positioning a plurality of optical fibers; a circuit boardinserting into the second slot transversely, coupled to the surface ofthe main board, and electrically connected to the main board; a transferboard inserted into the first slot longitudinally, and located betweenthe fiber joint and the circuit board, the transfer board comprising afirst surface and a second surface adjacent to each other, and the firstsurface facing towards the fiber joint; a plurality of metal tracesarranged spaced apart on the transfer board, each of the metal tracesbeing arranged on both the first surface and the second surface of thetransfer board; a plurality of photoelectric elements coupled to thefirst surface of the transfer board and axially aiming to the opticalfibers, respectively; and two amplifiers located on the circuit boardand electrically connected to the circuit board and the photoelectricelements respectively through the metal traces.
 2. The opticaltransceiver of claim 1, wherein the main board has a plurality ofprinted traces, each of the printed traces is electrically connected toone of the metal traces and one of the amplifiers respectively throughtwo wires.
 3. The optical transceiver of claim 1, wherein the main boardhas a plurality of printed traces, each of the printed traces iselectrically connected to one of the amplifiers through a wire, and iselectrically coupled to one of the metal traces directly.
 4. The opticaltransceiver of claim 1, wherein the main board has a plurality ofprinted traces, the amplifiers are respectively electrically coupled tothe printed traces directly through a flip chip method, and the metaltraces are respectively electrically coupled to the printed tracesdirectly.
 5. The optical transceiver of claim 1, wherein the circuitboard comprises a first block and a second block, the second blockprotrudes from a side of the first block, the second block is insertedinto the second slot of the connection base transversely, the amplifiersare located on the second block in parallel.
 6. The optical transceiverof claim 5, wherein the second block of the circuit board contacts aninner surface of the second slot.
 7. The optical transceiver of claim 1,wherein the fiber joint comprises: a joint body; a light signal outputportion located at one end of the joint body facing towards the transferboard; a receiving recess located at one end of the joint body beingopposite to the transfer board for accommodating the optical fibers; anda plurality of positioning channels arranged in the light signal outputportion for respectively positioning the optical fibers so that lightincident surfaces of the optical fibers axially aim to the photoelectricelements, respectively.
 8. The optical transceiver of claim 7, whereineach of the positioning channels passes through two opposite surfaces ofthe light signal output portion, an aperture diameter formed by thepositioning channels on the surface of the light signal output portionfacing towards the transfer board is smaller than an aperture diameterformed by the positioning channels on the surface of the light signaloutput portion facing away from the transfer board.
 9. The opticaltransceiver of claim 8, wherein an aperture diameter of each of thepositioning channels gradually narrows from the receiving recess to thelight signal output portion.
 10. The optical transceiver of claim 7,wherein the fiber joint comprises: a fiber gasket mounted on thereceiving recess, the fiber gasket comprising a plurality of divisionalislands arranged spaced apart and respectively defining a plurality ofguiding slots for respectively guiding the optical fibers to thepositioning channels correspondingly.
 11. The optical transceiver ofclaim 10, wherein two ends of each of the divisional islandsrespectively have a guiding camber for guiding the optical fibers to adisposition direction.
 12. The optical transceiver of claim 7, furthercomprising: a lens set comprising: a lens body fixed between the fiberjoint and the connection base, the lens body comprising a firsttransceiving surface and a second transceiving surface disposed oppositeto each other; a plurality of first lenses disposed on the firsttransceiving surface axially aiming to the positioning channels,respectively; and a plurality of second lenses disposed on the secondtransceiving surface axially aiming to the first lenses and thephotoelectric elements, respectively.
 13. The optical transceiver ofclaim 12, further comprising at least one guide post, the connectionbase having at least one first positioning hole, the lens body having atleast one second positioning hole, the joint body having at least onethird positioning hole; wherein the at least one first positioning hole,the at least one second positioning hole, the at least one thirdpositioning hole are coaxial and co-receive the at least one guide postinserted into the at least one first positioning hole, the at least onesecond positioning hole, and the at least one third positioning hole sothat the lens set is fixed between the fiber joint and the connectionbase.
 14. The optical transceiver of claim 1, wherein the second surfaceof the transfer board is a surface of the transfer board being oppositeto the main board.
 15. The optical transceiver of claim 1, wherein thesecond surface of the transfer board is a surface of the transfer boardfacing towards the main board.
 16. The optical transceiver of claim 1,wherein the photoelectric elements are a combination of light emittingdevices and light detecting diodes which are arranged on the firstsurface of the transfer board in a matrix.
 17. The optical transceiverof claim 16, wherein one part of the metal traces electricallyconnecting to the light emitting devices are arranged in parallel on onepart of the transfer board, and the other part of the metal traceselectrically connecting to the light detecting diodes are arranged inparallel on another part of the transfer board.
 18. The opticaltransceiver of claim 1, further comprising: a plurality of metal lineargrooves arranged in parallel between the metal traces alternately,wherein each of the metal linear grooves is formed on both the firstsurface and the second surface of the transfer board, and electricallyisolated from the metal traces, one of the metal linear grooves isarranged between any two neighboring ones of the metal traces.
 19. Theoptical transceiver of claim 1, further comprising: a plurality ofanti-soldering lines arranged on both the first surface and the secondsurface of the transfer board which are spaced apart and in parallelbetween the metal traces alternately.